The dig refers to the notion that Trump needs mature supervision on the job. Corker first referred to the White House as an “adult daycare center” late last year after Trump attacked him in a fusillade of tweets.

It’s a shame the White House has become an adult day care center. Someone obviously missed their shift this morning.

A source told CNN White House correspondent Jim Acosta just days after Defense Secretary Jim Mattis tendered his resignation that the president was furious by news coverage of the event because it resurrected the “adult daycare” idea for the president. Mattis was considered one of the “adults in the room” at the White House, Acosta noted.

Now Twitter’s on board with the idea, thanks to the hashtag Corker included when he fired off a message to Trump making fun of the president’s story that Mexico will pay for his border wall. The rejoinder followed a Trump attack on Corker.

Twitter users appreciated the joke, while some quipped that it’s possible all the “adults” in the White House have already left the premises. Or, maybe they’re not being paid due to the ongoing partial government shutdown.